2
Fourteen and fifteen
Discover Mathematics: Chapter 3
GoalCount, read and write 14 and 15, and see 15 as three hands of five.
New words
fourteen · ten and four morefifteen · ten and five morehand of five · five fingers on one hand
Explanation
Fourteen is ten and four more. Fifteen is ten and five more. On two ten-frames, fourteen fills the first frame and four squares of the second. Fifteen fills the first frame and the top row of the second frame. One hand shows five fingers, so fifteen is three hands of five. Write 14 and 15 with two digits and say each number as you write it.
Worked examples
Fourteen is ten and four more. The first frame is full and 4 squares of the second frame have counters.
Fifteen is ten and five more. The second frame has a full top row.
Two hands show 10 fingers. One more hand shows 5 more. That makes 15 fingers.
Class activity
Fifteen fingers. Two children show ten fingers together, and a third child adds one hand. Count all the fingers together up to fifteen. Then count the fingers again in a different order. The number stays fifteen.
Practice
1
How many fish are there?
14
2
How many bananas are there?
15
3
There are 10 oranges in the box and 4 oranges outside. How many oranges are there in all?
14
4
What is one more than 14?
15
5
What number comes before 14?
13